This isn't exactly a plumbing issue but I didn't think any other forum here was more appropriate. We have an old concrete laundry sink from the 1930s (pictures below). We intend to keep it, not replace it. It has decades of soap scum build-up and such. I'd appreciate advice on the best way to clean it up as much as possible (I've tried just a stiff brush and water, but that doesn't do anything). I don't intend to paint it, so I'm not trying to etch it. I don't want to use anything dangerous such as muriatic acid. Would white vinegar be good? Or what about a concrete cleaner (such as used for driveways), although there's no oil or grease on the sink. Thanks for your help. /Rav
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